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This lesson is about the sound waves surrounding us.
This lesson helps to understand the Doppler effect.
Direct action pumps and suction pumps are among the simplest water pumps.
Is a matchbox able to imitate the croak of frogs? With the following experiment we reveal the...
Experience the relationship between pitch and frequency through measurements.
It is a well-known phenomenon that the sound of an approaching sound source is higher...
Can a candle be re-lit if the flame of the match does not even touch it?
A hot air balloon is a balloon aircraft which is lifted by hot air.